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A015721
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Composite and even n such that phi(n) * sigma(n) is one less than a square.
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1
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6, 22, 44, 76, 82, 140, 190, 354, 392, 650, 944, 1072, 1142, 1150, 1668, 2276, 4176, 4192, 4262, 5090, 7260, 8660, 15026, 16064, 22926, 29746, 39436, 42872, 74666, 87498, 94786, 101882, 115772, 118928, 127580, 151348
(list; graph; refs; listen; history; internal format)
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